I have a 1991 1500 with a 350 tbi in it . i have a rebuilt 89 305 carb on hand . I don’t really mind the downgrade mostly because it’s a work truck and mpg is better with 305 . I’ve heard that it should be out and in . But I took it to a mechanic and he said it’s gonna require “special” pieces to run . Is this true ? I don’t know if I should continue with the swap. Other than the fuel system , what is different? Shouldn’t it be plug and play? Thanks